Spring 2007, MET 415 - FEA Applications I

Prof. Dave Johnson, dhj1@psu.edu, Penn State - Erie, The Behrend College

A HARDER Sample Problem for Exam 1

 

The cross section of a very long extruded aluminum window frame is shown in the figure. Follow the HW-2A instructions to create this shape (if you need to) Working Planes Exercise & HW-2A

Modulus = 10x106 psi Poisson's Ratio = 0.32 Before Solving, add 0.025" fillets at the indicated sharp corners Distributed load, P = 325 psi acts over 60o arc of round feature

TYPICAL TEST QUESTIONS:

1. What element type was used ?
2. What element options were used ?
3. What real constants were used ?
4. How many nodes and elements were created ?
5. What is the % error (SEPC) for your solution ?
6. What is the maximum deflection (in inches) ?
7. What is the maximum vonMises stress (psi) ?
8. Where does the maximum vonMises stress occur ?
9. What is the sum of forces on the model ?    S Fx =        S Fy =
        (Get the Reaction Solution from the General Postprocessor)

PLANE82, 2D 8-node quatrilateral element, Plane Strain Behavior 
1429 elements, 4711 nodes
SEPC = 11.6% (whole model), but < 1 % for the region under high stress.
Maximum deflection = 0.0086"

Maximum vonMise stress = 15,077 psi
S Fx = 0       S Fy = -40.625#